期刊
CROP PROTECTION
卷 20, 期 10, 页码 913-919出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0261-2194(01)00041-2
关键词
mute swan; winter crops; yield loss
类别
Yield loss due to grazing by mute swans was measured on two fields each of autumn-sown oilseed rape and winter wheat, located in three regions of the UK. Using a paired plot design, a 33.7% reduction in yield total dry weight of seed) and a 12.1% reduction in the thousand-seed weight was measured in the rape field subjected to the highest grazing intensity. No significant yield loss was measured in the other three fields. Yield loss was related to: (i) the timing of the onset of grazing, and (ii) the duration of grazing (both estimated from counts of mute swan droppings). Management measures which delay the onset of grazing and/or reduce the duration of grazing are therefore likely to reduce yield loss. Crown Copyright (C) 2001 Published by Elsevier Science Ltd. All rights reserved.
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